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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e9e82085123bbd85e7c4e43f6657a9775ee17696fbd3a3bed8ac249d7a41ed' 
  AND token = 'KYu210n34uz7cfoTlJnrmMaytEU27XDGvTPkx+MWk6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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