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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbca7e366a62fb872b1d123a8433ca43457c9f95c3db8ff9b5cdf38e38164bd3' 
  AND token = '3EfewEDjMUJKbUTWL0PSY97LO00p/eQMVGpzNOiIzPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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