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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69a0c9b481216e4dfeaf3195495ec578ac1ef0f7745d5cb94ed3da595657ba6' 
  AND token = 'ycY61Px37e7ummsiKJVQY4KCLTjV49bgZ8KqX4KYZyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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