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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41809797c0d3d4e32a7aff1b59cf6efd1cc26d4f0ba561e28c435bc1982317e3' 
  AND token = 'FiGP3wrXRl65xPwda33Ze46bw2rKV9Rg/Gbbs54Df4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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