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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbef9a28e1ca2bbc75879e1c1ae3db2e8ac8edc088fdbd145d2ccd048b61c9c' 
  AND token = 'L10ZdUjTf73Y/aI4DalmJHXIBKHQ1qPEumMVEfnLuJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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