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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d615f2a575ef0b2afdab4ed36d500ca9f566b2ed398fe396cd8b1c1a1c40f2' 
  AND token = 'Gg7EleSQzNYFo4eKEkKy1j6nTpG/b7n1kWN3ERDHKHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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