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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42304d8a58e24f4223ce6c70c2e0fbc5b8ab68c28059b362babc3a9e848e987c' 
  AND token = 'oXWigND3l+gHTg7Ofelhy2h7dzQj6fH54VeBeYPWf2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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