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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a31e6495f74cbf04b4543eb141d12f273a020655fa9f549638ba15ca40a4ad0' 
  AND token = 'd6dP4qGELbup+MtbW0ObOClCHnEunnj2/dGM+wmKnYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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