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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e037ec87db3d30af3fc23f693172ecdc8bc5ebc970e9d711303772d4bf5c610' 
  AND token = 'SDrPc5ZgdPGUx1uZBCL+ikwZxxFBifpmD4zHpD1SujE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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