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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdd2f5ffd5ff2efd1e6bab0d2e192ab5587025513a76f6eb25913e0f8903fc1' 
  AND token = 'sC3lICFnX6DqXZ3OoS4PZYr4kAdmalQqFOQM1suiRf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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