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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01cc68e146e7035d77caa2512a268de281fc1a1f98cd1b1ca7e1a8fab52b4c24' 
  AND token = 'PI45Y+6NHa8xSNKwXKMTNE25Sxo3YKulUDLCofpVwiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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