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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2de79c557cdd1ee45fe803a3a6620fdb441b098ebf35294cadb8e4d0a725e8' 
  AND token = 'tTwMX+q/9N+Zy44tdlSnfP1/YJ6DoSEdAHLd7/HtzII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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