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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d6be5754004dcaa1f112d5e987c24f988f21b2cdd30f7a56b91eb46b1b0250' 
  AND token = 'pDLt4fhXvKdGg/dWMdsvO0BL2LaD9EjjEwBNBkQJlOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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