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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37bb54911be84527173968e0882e99e4ed8c91ce271907e2adfe137b16394ea' 
  AND token = 'VV5xC01vgRYI2Q7Tly3MoeRYh3Hk8PdeQolyrLPjqms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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