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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6b063f00363aadff7d3f03cbd8b724229aa4ba230add0471f5dd6de2346a17' 
  AND token = '0fG3+m8thZR8kQ7a6wzIbZyPNnTrL5TR+CDtxcBUFxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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