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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946cd8e0a98164e752892a8dd8d00a8d5d891cad460c36fd2bed7a76c8500ca1' 
  AND token = '9GIMFt9GjAZNKbewdKZ0PvHC4tV1Rr8rSGIWdqX1M84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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