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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdea3946a38fef71f2042f5faf63380f1ea88dc942500d14c91eb38cb8046b76' 
  AND token = '1WN9ivM3lUYdcMdB+qKEmnn9j/yO/huMX3b/MEdhp1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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