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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4314baea9044740bd2426390c7eda1c4489eda9512140bd7eda23d1bf89030' 
  AND token = 'vo+/gvJwEyc4jk+9YY+d1zXRypaZQYoBvsLVN4m4eeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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