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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d7dfbcbcf96e2d9cd0188f8dc9b05c9481c780c4e94f0818028a75cb0d00d' 
  AND token = '+t+uvQsGSKr0Sml3ayd3mvpbWWin/J+zOYRmbD5mttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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