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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e861aad73ec2ecf0b2607a70bda1a0d3ee2e0df0379ff62dbbda978ee9be508' 
  AND token = '6fVQwc4osb110H5OTmLOH/4PQR9JolWt5svC7SkGYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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