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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3ccb1a82fede3f3da17993d8e4f627f95f28ffa89bc093e819e081056aea92' 
  AND token = 'KSdeqeMe8pLkpfHSSL45QmEeD7KnQH3SzC9EY5235xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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