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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a9c93a0aa51d5f4462d0238de573e17acd595c9718aede2e85d70c0984abef' 
  AND token = 'U344Jg2ofcaDEsR6tr1bLIfbZGl3T43VlJqSb3gCog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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