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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6132d45c8b679a8076e9e96ce0a9c9005b29a9376f4d47506b0893924637f77e' 
  AND token = 'h0TaqGansSS4p5gLm1Hppe0KopqKNqhPfWh4we2itpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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