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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10b4dc5413e4369945eb437cb9fcb056eaa441c42e9897bcf451844d98a53be' 
  AND token = 'njzJYUw+MOJYSOM3tmPofhpm3wi55QLOh/j1BeL3w2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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