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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f744f3ca7d05d3a80ddfbce99d2f7a44735f3417c498c7ff34c059acfdc6853' 
  AND token = '6ibBO5S0IVaq90CB/X4DsISoNhajp0uuxPBeV0AvFXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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