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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e9c89658eee959e5b10fc399f12ff6dd38804ead3ec3a5ef29d84c2d7ea085' 
  AND token = 'vsbKTKFw5D89NSDUEKnmc/UwYB+dpWL/m/QPcGeLWuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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