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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f4540efaf44db3350f324d529fd4ae7499476cd909418eb77d80bdbf7c5e92' 
  AND token = 'GLaI9mwJLD9fhqmdpYLZlC1bJ2swtXcuOFAr1yGrzGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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