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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38a195f8dd2c9a52654f76d36727e9d31c311456ed5fb3dedf10d48ca8eddc9' 
  AND token = '1fWd+TJgXOjfk1pf98aNWU4EMZc2/Kngj0KdwSShg2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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