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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db45df0ac1b2cfbfa88295c2473f6fa6b9b2d630afe3f5f5144f90c488cdefe1' 
  AND token = 'N69HfExWaLGt6Iq+h9wcZzWIRNJV71lCwVkN8ymKEkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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