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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1b1b7004adf009b134c732ce6680ab788d803326ea4e3d0b210da168e80ddb' 
  AND token = 'vqa/4x1Z2qMCkvEsYZdgYVbadO+MTK13+V4LdAG6WgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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