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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b564a202051ae05f9e21ad35e7f6fad6f1aeaf6e53f79e86526ea4d1972e7bf5' 
  AND token = 'Hi0SSeOpccHoQrDcLTphE12j237mfANvndB1jEf7Ffk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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