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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960f8ebacad06f2f16dfe0962b7f6587b16bcae328f9f82daecc52bac1998d55' 
  AND token = 'Yo9dMpPMb/zLVXxaaoBB6VTSiWC5zF6kpxTM1lJHLQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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