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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbd593a0e6b20b16dce91e7971097ff5b75f5bb3caad06b5f9e9a028c762dca' 
  AND token = '40o5H6BhDZqCimCfvRBYbnPFcXJILSc5Xzb8aqDj864=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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