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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0091631606323d4c0f678369b0d66ae340a638438f7e10fc3edcc32e085b6' 
  AND token = 'AxG/aW9OndA1q0L/YMrCQBNwBg164sp5Ue1KY+B2ZS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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