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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3d15acd5f1d46671790973e0c51982c29c9f09d08bf367807b689eda51722d' 
  AND token = 'skRNfdDOqcmIcHrNmmyU5vuiOFzBhz9h8ACd/2A6UCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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