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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e0d51d3b5812f43b42a1c4131467712d036d8eab7b0b59a0732a7c19ed92e0' 
  AND token = '76VVW8XvAxXMYCgNIOyxwit93AlYnXxsIwsEZtDbVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}