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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2bb15363b7bd7e6859acb36ca49415a9d6deef5e27c615b26aad923e3e73e6' 
  AND token = '4jwM09KV5qwCHRH9iXze8X3Peu09Odj6/RPOrbCgLQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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