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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b162405e76da77e43b6de9d1cc7631bcb680d9df764eef576996de42382dbf58' 
  AND token = 'y/pCX8Z7m387Bcj1SrIduWOobVNzucfQlYt146CRMks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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