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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baca0ebd47c8e3d51c8e1452736984ba89d78d6ece5f56ce267a1a451b8811ee' 
  AND token = 'Vw1vDuz/7108x9+cFWHwZQLxcr1xgH3Hh+Kezy7NfZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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