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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05e49189b6ff5985399d3f002838869836cfecd2bcaeaba6aa551fae82c6b01' 
  AND token = '7ylwne2tqr58IA3qDu6QFn52mvCQju+e1E/B2pm3CM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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