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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1d972cf62e669793ebf63f90d471c4fcf3d01b03c8def52460cff8ac50688b' 
  AND token = 'mnnqEL+P+rJAx+TL84xoUNOyRZdCc22e9hxmm/Aqjoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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