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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734a2d8300a8d6d07e954f6a985f70d1f3f4c8c313bdf0bd9904ef85c3d01eca' 
  AND token = 'QgsrYwrtTsSUKDMv2pt0gaHZZc5yqW30dNjOAwLNiT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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