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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21c9f54ac12e1e88ae8b07132b44f997854471e0e9ee69a21d6cde38905ac27' 
  AND token = 'Utrgq0x6ye7gDfhctgLOD4xKIhKPIA5OVmAe/aQdBJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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