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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092e23fdef937117d2c0b20a564ed89eafc4f80b2ee5a17fc2d2bdd356a325b6' 
  AND token = 'BKMkqyA9Cs2w37iN+x//nX1uMCXN2o4z0O7NaCCJ/RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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