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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55335b469c4b53c772489441788238cec306ea507b7acd8c16e50cfc03b9a489' 
  AND token = 'WHw7k4lVwHAbZl5IwH0Zl+U9rdpd9i6llijxoxaz+TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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