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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec87cbc64a605a1cff7dc2d299d0cb3079186d208826c5090893fe1f315d03ab' 
  AND token = '1MfVLC7bQfKsGQ+vuj3VID2RkIReAwFdURP7mFs37Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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