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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35195ce2cba678b85bfc61ee9b193cda3516e2e7bf0b42bbfc80524bb2da8e6d' 
  AND token = 'dGX727a5jDCO6scUi814rWk8J+yhBfvN0ep3No6jcek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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