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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcadaa33dad0e2fbfe2da18b10a18c4b16cc7c909319269be1bd3ed412efecd8' 
  AND token = '5M1TyAt2uuIUboyVenmrQCnaAf58lV7mO++fnyZiMps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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