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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e09feb2c79135467582e53415333ce75db240e4e86100c4baec9d84a53d8600' 
  AND token = 'p2tZiIVbR3NReI0lvqhru38aLrvGodC5+do3Ilp5wFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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