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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd1e0b389e88a2cf604f6393b01184fdd5ee0c6e6b1b8d57157b3cc939df3da' 
  AND token = 'lOqTmf1LTh8TGyTeJs7XVGXYcgV0yJ2d3W3/XM0Jrf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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