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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5384dd8252e7c5dd227655ef68a83abbcb1c7e0731c40792147c499c2e630dbb' 
  AND token = 'kNEKTc2MNmVTbYwpjrAQ0gy1YPWEQsbDQUtP/RZE9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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