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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f532a2c030586c6ebdefb63dc47ed286ab2a5ba64e1c0230df3655d46371a5f4' 
  AND token = 'z9paEwwYoITmrbJnD3soVDY+FGw8DMVanGGdsbZzReE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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