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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8121c98e529b61082de84bc370c2532021f215e194d96027f4159e104d82fe' 
  AND token = 'ahYVTfdsl3ekBch/50010VF6uroTiDqhxQlAPVcexzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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