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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a2dc47b56b8a3369537381f0497fecac3807dd40c3d108dc1a0e15953378d0' 
  AND token = 'G4g7nM3XMFOcDbKp0wi9a4dWDPgouapBkwp5GlAVKmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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