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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7a797c40e34d304010af7fcf3937fe51e0ec555542d2da4b91a20966daeca4' 
  AND token = 'v2PTr6oMRwgGb44VNNg1/ZxqSwM3fqE3Rr3oQG2TmPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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