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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11470a3a000bc880b5c9f0025ca837479a8bcfc6f90185e35e39a59b9267c60f' 
  AND token = 'KkdRXzPBrPEGohLVQHLLqjAR3k4pLMX1yYK40zoaGCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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