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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81d97d60616695beb3fe67709e312056b0fa7c6dd413de22d5a65d59b677c5a' 
  AND token = 'cUrMXe8v/q47MNkMhubCDC5rkwTjl7/1s81Ti/gfCos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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