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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884e8d4c657fa46dd719c27b2e4d9920524757423d24a835dfd4aeabab86a541' 
  AND token = 'hK+EMPEa4DYYOj8cZUoOV229TfCCHk30PnisCXbY+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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