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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0359a1aed674aa2a8bf316ba0fd1a9332796769016ee7cee9f5fdcd039a1ac9' 
  AND token = 'bu9qKBBpW7D9t0VsboXoRlN9n2cKGhxyGaOSTJNTpuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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