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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bd3d0be554554682897cb3f9a3c85a13586944bb40fc3cfb5a5587ab4ee930' 
  AND token = 'zld5xr3fTSvrh99sFYZRxO5zHxzlUKtibolMa0Dw2Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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